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From: James Cleverdon <jamesclv@us.ibm.com>
Reply-To: jamesclv@us.ibm.com
Organization: IBM xSeries Linux Solutions
To: Guido Arenstedt <ga200@doc.ic.ac.uk>, linux-kernel@vger.kernel.org
Subject: Re: Hyperthreading in -ac series
Date: Fri, 20 Sep 2002 15:47:59 -0700
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On Friday 20 September 2002 03:36 pm, Guido Arenstedt wrote:
> Hyperthreading does not seem to work in the -ac series
> it works fine with a stock 2.4.19 kernel
>
> during bootup i only get the message:
> WARNING: No sibling found for CPU 0.
> WARNING: No sibling found for CPU 1.
>
> or is this done on purpose?

The latter.  Hyperthreading _is_ working in the kernel, but it is not finding 
"sibling" CPUs to match the real ones.  (Or, as we prefer to call them, 
DiVitos to match the Schwartzenegers.  ;^)

Check your BIOS.  Some turn off hyperthreading by default.  (Notably, IBM's 
x440....)

-- 
James Cleverdon
IBM xSeries Linux Solutions
{jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot com

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